Temples are the places where Jains have the
idols of their Jinas (those who have conquered their passions).
They go there to worship the Jina. All Jains don't worship
idols. The main reason to worship is to pay respect to the souls
that have reached salvation. This also reminds us that we should
be like them. Just praying and not taking any actions to free our
soul does not work. We must discipline ourselves so that we can
control our desires and karmas.